TS Gateway and OWA on different servers requiring port 443 with 1 public IP

I have a network with an SBS 2003 Server that hosts OWA and some other websites that accept port 443 traffic.

I want to trial Windows 2008 TS Gateway to allow easy remote access to terminal services. I have a new 2008 virtual server set up with just what is needed for the TS Gateway service. This install was easy, but it seems I need port 443 going to this server. How can I separate the traffic for one server from that for the other?

More on the network:  There is a single public IP address that goes through a PIX Firewall and redirects to the SBS server. The SBS server has ISA 2004 installed, but the server has been set up to team the network cards (I assume for redundancy) and so ISA pretty much functions as a web cache.
littlehogarthAsked:
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tigermattConnect With a Mentor Commented:

You could ask your host regarding two IPs, but yes, you should be able to plug them into your firewall just fine.

-tigermatt
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tigermattCommented:

The only way in which I can foresee you being able to do this would be to use a differnet port number externally (say 445), which maps internally to port 443. This would be a change you'd have to make in the PIX Firewall configuration.

I would probably make the change so that:

-Port 445 (external) is open to port 443 (internal) - IP: SBS Server
-Port 443 (external) is open to port 443 (internal) - IP: 2k8 TS Gateway server

That's the only easy way by which this would be possible.

-tigermatt
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littlehogarthAuthor Commented:
Yes thats what I thought.

As I believe the RDP client settings for TS Gateway cannot take a port value and so is locked to using 443. Could change the other web server, but have found some posts saying changing OWA can cause issues, plus the whole benefit of having only needing 443 open is lost.

My other thought was just manning up and getting an additional IP. Do you know if two IPs use the same modem?
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littlehogarthAuthor Commented:
Thanks Tigermatt, I just didn't want to get a second IP if there was another simple way to manage this.
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